Just for anyone who is still having the same problem; I was stuck in this parental loop for a long time.
I was able to login again after doing something like this (all of this is from what I can recall after a late night try, so the exact options/screens can vary a little, but you can find those out after navigating around a bit).
- In the parental screen (or login options screen), there is a link to 'Learn more about parental guidelines/rules'.
- Click and navigate to that link and it will show your local rules/policy about this. There you will get an option to update account details or to add a parent account.
- In my case, a wrong birth date was the problem but you can update any of these to get back into your account.
- Just a side note, if you have made too many attempts at logging in, you may get 'too many attempts' error, even after this step. Try logging in at a later time and it goes through.
Hope this helps.